Addiction and neural ageing
Addiction and neural ageing

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

Glossary


Glossary for SD805_2
Browse the glossary using this index

Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL

Page:  1  2  3  4  (Next)
  ALL

N

naloxone

An antagonist to opioids. It can cause distress and some signs of withdrawal if injected by heroin users, a so-called naloxone challenge.


narcotic

An opioid (opiate) drug, e.g. morphine or heroin.


natural selection

Driving force of evolution as described by Darwin. In the competition for resources between individuals in an environment that cannot support all of a population, a natural process of ‘selection’ occurs in which individuals with the most adaptive characteristics are more likely to survive and reproduce.


nature–nurture debate

This refers to debates about the relative contributions of genetic inheritance (nature) and environmental influences (nurture) to the physical/ behavioural characteristics of an organism or species.


negative cognitive set

Tendency to construe the world in negative terms; characteristic of a depressed mood.


negative feedback

(in cell metabolism) Also called end-product inhibition. It is the mechanism by which a metabolic pathway is regulated: when the product of the pathway exceeds a critical concentration, it ‘switches off’ an enzyme early in the pathway, thereby preventing further synthesis of the regulatory end-product.


negative feedback system

A system in which a displacement of a variable from a state causes corrective action such as to return the variable to that state.


negative reinforcement


nerve cell

Another name for a neuron.


nervous system

The collection of all of the neurons of the body, in brain, spinal cord and periphery.



Page:  1  2  3  4  (Next)
  ALL


Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to University-level study, we offer two introductory routes to our qualifications. You could either choose to start with an Access module, or a module which allows you to count your previous learning towards an Open University qualification. Read our guide on Where to take your learning next for more information.

Not ready for formal University study? Then browse over 1000 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus371